/Engine/Source/Editor/UnrealEd/Public/Kismet2/BlueprintEditorUtils.h
Replace all references of the old actor with the new actor
static void ReplaceAllActorRefrences ( [ULevelScriptBlueprint](API\Runtime\Engine\Engine\ULevelScriptBlueprint) * InLevelScriptBlueprint, [AActor](API\Runtime\Engine\GameFramework\AActor) * InOldActor, [AActor](API\Runtime\Engine\GameFramework\AActor) * InNewActor )